单项选择题

A. It helps the body to digest food.
C. It helps the body to absorb calcium.
B. It keeps milk fresh.
D. It prevents sunbum.
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单项选择题
A. He drives too fast. C. He plays his guitar too loudly.B. His radio wakes her children up. D. His friends are too noisy.
A. He drives too fast.
C. He plays his guitar too loudly.
B. His radio wakes her children up.
D. His friends are too noisy.
单项选择题
A. Electric cars. C. California’s pollution laws. B. Increasing fuel efficiency. D. Automobile safety.
A. Electric cars. C. California’s pollution laws.
B. Increasing fuel efficiency. D. Automobile safety.
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